The CS5506 is a low-power CMOS analog-to-digital (A/D) converter is ideal for measuring low-frequency signals representing physical, chemical, and biological processes. The CS5506 member has four pseudo-differential analog input channels. Samples upon command up to 100 output updates per second. The on-chip digital filter offers superior line rejection at 50 Hz and 60 Hz when the device is operated from a 32.768 kHz clock (output word rate = 20 Hz). Includes on-chip, self-calibration circuitry, which can be initiated at any time or temperature to ensure minimum offset and full-scale errors. Serial port offers two general-purpose modes for the direct interface to shift registers or synchronous serial ports of industry-standard microcontrollers.